Tothemoonimus's facebook page has a photo of a Soviet era man-hole cover. Note that this facebook page does not let you post or comment on the page, you may like & share. The man-hole cover has two tabs on it, one on each side. I've seen these while walking in Lviv and Kiev. There's a "like" on the photo by "Robert Crypto" who's facebook page is loaded with lots of Russian and ? ICO details & events.